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FILE - In this Nov. 8, 2010 file photo, Harriet Butler, now 102, left, and her daughter Marcia Savarese, are photographed at Savarese's home in Vienna, Va. Safety researchers expressed concern a decade ago that traffic accidents would increase as the nation’s aging population swelled the number of older drivers on the road. Now, they say they’ve been proved wrong. Today’s drivers aged 70 and older are less likely to be involved in crashes than previous generations, and less likely to be killed or seriously injured if they do crash, according to a study released Thursday by the Insurance Institute for Highway Safety. That’s because vehicles are getting safer and seniors are generally getting healthier, the institute said. (AP Photo/Alex Brandon, File)

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FILE - In this Nov. 8, 2010 file photo, Harriet Butler, now 102, left, and her daughter Marcia Savarese, are photographed at Savarese's home in Vienna, Va. Safety researchers expressed concern a decade ago that traffic accidents would increase as the nation’s aging population swelled the number of older drivers on the road. Now, they say they’ve been proved wrong. Today’s drivers aged 70 and older are less likely to be involved in crashes than previous generations, and less likely to be killed or seriously injured if they do crash, according to a study released Thursday by the Insurance Institute for Highway Safety. That’s because vehicles are getting safer and seniors are generally getting healthier, the institute said. (AP Photo/Alex Brandon, File)

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This 2013 photo released courtesy of the San Carlos Apache Tribe shows Vernelda Grant, director of the Historic Preservation and Archaeology Department for the San Carlos Apache Tribe, left, with Vincent Randall, cultural director for the Yavapai-Apache Nation, center, and Wally Davis Jr., vice chairman of the Tonto Apache Tribe, gathered near the Verde River in central Arizona. Two dozen tribal ceremonial items purchased last year at auction in France are set to return to Arizona. A U.S. charitable foundation paid $530,000 for the hoods and ornate masks to give them to the Hopi and two Apache tribes, which use them to invoke the ancestral spirits in ceremonies. (AP Photo/Twila Cassadore, San Carlos Apache Tribe)

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People take photos of the frozen waters and snow of Lake Michigan that have formed huge ice caves along the shore of northern Leelanau County, between Northport and Leland, Mich., on Wednesday, Feb. 19, 2014. Sub-zero temperatures in late December through mid-January, along with strong winds and heavy snowfall, created the huge ice ridges several hundred feet from shore. (AP Photo/John L. Russell)

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People take photos of the frozen waters and snow of Lake Michigan that have formed huge ice caves along the shore of northern Leelanau County, between Northport and Leland, Mich., on Wednesday, Feb. 19, 2014. Sub-zero temperatures in late December through mid-January, along with strong winds and heavy snowfall, created the huge ice ridges several hundred feet from shore. (AP Photo/John L. Russell)

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People look at an ice cave at Lake Michigan along the shore of northern Leelanau County, between Northport and Leland, Mich., on Wednesday, Feb. 19, 2014. Sub-zero temperatures in late December through mid-January, along with strong winds and heavy snowfall, created the huge ice ridges several hundred feet from shore. (AP Photo/John L. Russell)